New research shows Indigenous infants begin life with richer gut microbiomes than urban-born peers, suggesting modern lifestyles erode microbial diversity critical to immune development.
By yourNEWS Media Newsroom
Infants born into remote Indigenous communities carry significantly more diverse and functionally beneficial gut microbiomes than infants born in urban, non-Indigenous settings, according to a new peer-reviewed study that challenges prevailing assumptions about the origins of chronic disease.
The research, conducted by scientists from the Walter and Eliza Hall Institute and the Peter Doherty Institute in collaboration with Elders in Australia’s Northern Territory, analyzed gut microbiome samples from 50 Indigenous infants in the Yolngu community and compared them with existing data from non-Indigenous infants of the same age. The findings, published in Nature Communications, show that Indigenous infants host a broader range of bacteria, viruses, and fungi during the first year of life.
Researchers found that these infants possessed higher levels of fiber-degrading bacteria, including Prevotella, and were dominated by Bifidobacteria, microbes widely associated with immune regulation and metabolic health. By contrast, the microbiomes of urban infants showed lower diversity and a markedly different microbial composition, even at the same developmental stage.
Professor Leonard Harrison, the study’s lead author, said the findings highlight an early biological advantage that later erodes. “Indigenous infants start life as some of the healthiest Australians, but statistics show this drastically changes over time,” Harrison said, pointing to rising rates of chronic disease later in life.
The study’s authors emphasize that the human gut microbiome, often described by researchers as an essential but overlooked organ, plays a central role in digestion, immune system training, inflammation control, and metabolic regulation. The microbial ecosystem develops rapidly during the first three years of life, a period now understood to be critical for long-term health outcomes.
Researchers noted that many microbial species observed in Indigenous infants were largely absent from non-Indigenous populations, suggesting that Western lifestyles have driven a generational loss of microbiome diversity. Professor Beverley-Ann Biggs, who led fieldwork for the project, said the findings demonstrate “how Western lifestyles have reshaped the gut microbiome over generations.”
The study does not attribute later health disparities in Indigenous populations to innate biological differences. Instead, it suggests that environmental changes associated with urbanization—including diet, housing, medical practices, and reduced environmental microbial exposure—gradually dismantle an initially robust microbial foundation.
Researchers highlighted early medical and environmental factors that may contribute to this divergence. Hospital birth practices, particularly cesarean deliveries, limit exposure to maternal microbes normally transferred during vaginal birth. Standard postnatal procedures such as early bathing and antibiotic applications, combined with highly sanitized hospital environments, may further reduce microbial transmission at a critical developmental stage.
The authors caution that while modern medical care remains essential, its long-term biological effects warrant closer examination. They argue that the findings support reevaluating birth and early-life practices through the lens of microbiome preservation, particularly as links between reduced microbial diversity and inflammatory, metabolic, and immune-related diseases continue to emerge.
The research also reframes public health discussions surrounding Indigenous communities. Rather than viewing Indigenous health outcomes solely through a deficit-based lens, the study documents a biological strength present at birth that diminishes as traditional environments and practices are replaced by Western norms.
Researchers say the findings underscore the importance of early-life environments in shaping long-term health and suggest that strategies to prevent chronic disease may need to begin far earlier than previously recognized, focusing on preserving microbial diversity during infancy rather than attempting to correct its loss later in life.
Source: Natural News
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